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ENH: hyperplane() improvements and calculate() parameter vectorization (#274)

- Adds a `obj_parameters_2d` function to `PhaseRecord`, which allows broadcasting an array of degrees of freedom against an array of parameters.
- Rewrites `hyperplane` for performance to use the system memory allocator, instead of Python, to create arrays. `hyperplane` is now a `nogil` function.
- An algorithmic improvement to `hyperplane` uses the fact that points above the candidate hyperplane at a given iteration can never be on the solution hyperplane. This means we only need to compute driving forces for points below the candidate hyperplane.
- `calculate` now supports a vector of parameters (dict of equal-length lists) as an argument. An extra dimension is created in the output Dataset to accommodate this. For the case of single-valued parameters, the extra dimension is omitted in the output for backwards compatibility. There's now a data array called `param_values` with coordinates called `samples` and `param_symbols`, where param_symbols is a coordinate with the parameter symbol names as strings

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